DE112017001018T5 - Welded product made of a stranded wire and an object to be welded therewith, connecting piece, ultrasonic welding device, and method for welding a stranded wire with an object to be welded therewith - Google Patents

Abstract

It is an object to weld together an end portion of a strand comprising a plurality of individual wires and an object to be welded thereto with as high a welding strength as possible. A welded product of a strand having a plurality of individual wires and an object to be welded thereto comprises a strand comprising a plurality of individual wires and an object to be welded thereto (for example, a joint) which overlaps the strand while being overlapped with the strand , Ultrasound has been welded. The distance between a part of the strand which has been welded to the object to be welded thereto and a part of the strand opposite thereto, at least partially increases in a direction in which the strand extends to a distal end of the strand.

Description

TECHNICAL AREA

The present invention relates to a technique for ultrasonic welding a strand having a plurality of individual wires with an object to be welded thereto.

TECHNICAL BACKGROUND

Patent Document 1 discloses a technique for ultrasonically welding a welded wire forming portion of a connector and a wire of an electric wire, wherein the welding portion and the wire formed for the electric wire are embedded between a pickup tool and a sonotrode.

PREVIOUS TECHNICAL DOCUMENTS

PATENT DOCUMENTS

Patent Document 1: JP 2014-143177A

OVERVIEW OF THE INVENTION

TASK TO BE SOLVED BY THE INVENTION

However, when the welded portion of the connecting piece formed for an electric wire and the wire of the electric wire are ultrasonically welded in the manner disclosed in Patent Document 1, sufficient welding strength can not be obtained.

The object of the present invention is to make it possible to weld together an end portion of a strand comprising a plurality of individual wires and an object to be welded thereto with as high welding strength as possible.

SOLUTION OF THE TASK

In order to achieve the above-described object, according to a first aspect, a welded product of a strand and an object to be welded thereto comprises: a strand having a plurality of individual wires; and an object to be welded ultrasonically welded to the strand while spliced with the strand, at least partially separating a portion of the strand which has been welded to the object to be welded thereto and a portion of the strand opposite thereto in a direction in which the strand extends gradually increases toward a distal end of the strand.

A second aspect provides the welded product of a stranded wire and an object to be welded therewith according to the first aspect, wherein the object to be welded is a connecting piece for a strand of a connecting piece.

In order to achieve the above-described object, according to a third aspect, a connector includes a wire connecting portion having a plate-shaped portion; and a counterpart connecting portion that merges into an end portion of the strand connecting portion, the plate-shaped portion having an inclined surface whose height distance gradually decreases toward the counterpart connecting portion.

In order to achieve the above-described object, a fourth aspect provides an ultrasonic welding apparatus for ultrasonically welding a strand having a plurality of individual wires to an object to be welded therewith, comprising: two pressurizing members between which an end portion of the strand and an overlap thereof to be welded Object are embedded; and an ultrasonic vibration source that outputs ultrasonic vibrations to one of the two pressurizing members, wherein a gap between a surface to be welded of the object to be welded supported by one of the two pressurizing members and a part of the other of the two pressurizing members compresses the end portion of the wire is selected such that the gap gradually increases at least partially in a direction in which the strand extends toward a distal end of the strand.

A fifth aspect provides the ultrasonic welding apparatus according to the fourth aspect, wherein one of the two pressurizing members has a placing portion which supports the object to be welded with the object to be welded thereon, and the other of the two pressurizing members has a pressing portion joined to the one welding the welding object overlapping end portion of the strand, and the placing portion is formed such that the object to be welded superimposed in a direction in which the object to be welded gradually recedes from the pressing portion toward a distal end of the strand.

A sixth aspect provides the ultrasonic welding apparatus according to the fifth aspect, wherein the placing portion is formed so as to recede at the distal end of the strand, and the object to be welded superimposed such that the object to be welded is inclined downwards at the distal end of the strand.

In order to achieve the above-described object, a seventh aspect provides a method for welding a strand and an object to be welded thereto for ultrasonic welding a strand having a plurality of individual wires and an object to be welded thereto, comprising the steps of: (a) Embedding an overlapping arrangement of one end portion of the strand and an object to be welded therebetween between two pressurizing elements; and (b) ultrasonically welding the overlapping array of the end portion of the strand and the object to be welded therewith embedded between the two pressurizing elements, wherein a force directed toward the distal end of the strand is applied to those of the plurality of individual wires which are arranged on one side of the object to be welded therewith.

An eighth aspect provides the method of welding a strand and an object to be welded thereto according to the seventh aspect, wherein, in the step (b), the ultrasonic welding is performed in a state in which a space is to be welded between a surface to be welded Object, which is supported by one of the two pressurizing members, and a part with which the other of the two pressurizing members compresses the end portion of the strand, at least partially in a direction in which the strand extends, gradually increases towards a distal end of the strand.

A ninth aspect provides the method of welding a stranded wire with an object to be welded thereto according to the seventh aspect, wherein in the step (b) the ultrasonic welding is performed in a state in which a gap exists between positions where each of the two pressurizing elements pressurizing the overlapping arrangement of the end portion of the strand and the object to be welded therewith, at least partially in a direction in which the strand extends gradually toward a distal end of the strand.

A tenth aspect provides the method of welding a strand and an object to be welded thereto according to any of aspects seven to nine, wherein the object to be welded is a connection portion for a strand of a connector.

ADVANTAGEOUS EFFECTS OF THE INVENTION

According to the first aspect, a distance between a part of the strand which has been welded to the object to be welded thereto and a part of the strand opposite thereto at least partially decreases in a direction in which the strand extends to a distal end of the strand gradually closed. Thus, at the time of welding the strand to the object to be welded thereto, a force directed toward the distal end of the strand can be exerted on the plurality of individual wires. As a result, the individual wires are less likely to be displaced between the strand and the object to be welded therewith, allowing the end portion of the strand and the object to be coated therewith to weld together with as high a welding strength as possible.

According to the second aspect, the end portion of the strand and the object to be coated therewith can be welded together with as high a welding strength as possible.

According to the third aspect, the plate-shaped member includes an inclined surface whose height distance gradually decreases toward the counterpart connecting portion. Thus, at the time of ultrasonic welding a strand having a plurality of individual wires to the plate-shaped member, the end portion of the strand and the object to be spattered may be ultrasonically welded to each other such that a force directed toward the distal end of the strand is generated. is exercised on the several individual wires. As a result, the individual wires are less likely to be displaced between the strand and the object to be welded therewith, allowing the end portion of the strand and the object to be welded therewith to weld together with as high a welding strength as possible.

According to the fourth aspect, a space between a surface to be welded of the object to be welded supported by one of the two pressurizing members and a portion of the other of the two pressurizing members compressing the end portion of the strand is selected such that the space is at least partially in a direction in which the strand extends gradually increases toward a distal end of the strand. Consequently, it is possible to weld an overlapping arrangement of the end portion of the strand and the object to be welded thereto, ultrasonic, wherein a force which is directed towards the distal end of the individual wires of the strand is applied to the individual wires. As a result, the strands become less likely to be between the strand and the strand moved to a welding object. Thus, the end portion of the strand and the object to be welded thereto can be welded together with as high a welding strength as possible.

According to a fifth aspect, the object to be welded is supported by the placing portion in a direction in which the object to be welded gradually recedes from the pressing portion toward a distal end of the strand. Consequently, the force directed toward the distal end of the strands of the strand can be easily applied to the strands.

According to the sixth aspect, in that the placing portion has a simple shape, the object to be welded can be stored and inclined downward toward the distal end of the strand.

According to the seventh aspect, the overlapping arrangement of the end portion of the strand and the object to be welded therewith embedded between the two pressurizing members is ultrasonically welded, with a force directed toward the distal end of the strand directed to those of the plurality Single wires is applied, which are arranged on one side of the object to be welded therewith. Thus, the individual wires are less likely to be shifted between the strand and the object to be welded therewith. Thus, the end portion of the strand and the object to be welded thereto can be welded together with as high a welding strength as possible.

According to the eighth aspect, in the step (b), the ultrasonic welding is performed in a state where there is a gap between a surface to be welded of the object to be welded supported by one of the two pressurizing members and a part to which the other of the two both pressurizing elements compress the end portion of the strand, at least partially in a direction in which the strand extends, toward a distal end of the strand gradually increases. Consequently, the force directed toward the distal end of the strands of the strand can be easily applied to the strands.

According to a ninth aspect, in the step (b), the ultrasonic welding is performed in a state in which a gap between positions where each of the two pressurizing members pressurizes the overlapping arrangement of the end portion of the strand and the object to be welded therewith, at least partially in a direction in which the strand extends gradually increases towards a distal end of the strand. Consequently, the force directed toward the distal end of the strands of the strand can be easily applied to the strands.

According to the tenth aspect, the end portion of the strand and the object to be welded therewith can be welded together with as high welding strength as possible.

list of figures

• 1 Fig. 13 is a diagram showing how a wire and a connector of the prior art are ultrasonically welded together.
• 2 FIG. 12 is a graph showing the holding force of a plurality of sample pieces obtained by ultrasonic welding the strand and the prior art connector, respectively. FIG.
• 3 Fig. 12 is a diagram showing the arrangement of single wires and the prior art connector.
• 4 is a schematic perspective view showing the welded product of a strand and a connector.
• 5 is a schematic cross-sectional view of the same welded product.
• 6 Fig. 16 is a schematic perspective view showing an ultrasonic welding apparatus.
• 7 Fig. 12 is a schematic perspective view showing a state in which the connector is supported on a placing portion of a holder.
• 8th FIG. 13 is a diagram exemplifying a method for forming the placement section.
• 9 Figure 11 is an illustration showing how the strand and a bottom portion of the joint between the pick-up tool and a sonotrode are ultrasonically welded.
• 10 Fig. 12 is a schematic diagram showing a pickup tool after a first modification.
• 11 is a schematic diagram showing a pick-up tool and a sonotrode according to a second modification.
• 12 is a schematic diagram showing a connector according to a third modification.
• 13 is a schematic diagram showing the connector according to the third modification.
• 14 Fig. 12 is a schematic diagram showing a fourth modification in which it is assumed that a strand is used as an object to be welded.
• 15 FIG. 15 is a graph showing the holding force of a plurality of sample pieces each obtained by ultrasonic welding the wire and the connector according to an embodiment. FIG.

DESCRIPTION OF THE EMBODIMENTS

DESCRIPTION OF THE RELATED ART

To facilitate the description, the background of the present technical teaching is described. 1 is a picture that shows how a strand 12 and a connection section 22 for an electrical wire of a connector 20 are ultrasonically welded together.

An electrical wire 10 has a wire 12 and a sheath 14 on. The jacket 14 is at an end portion of the electric wire 10 removed to the strand 12 at the end portion of the electric wire 10 expose. The strand 12 is formed by a cluster (usually a stranded wire) of several individual lines.

The connector 20 is formed, for example, by molding a metal plate. A welded section formed for an electric wire 22 which has a plate-shaped part is at an end portion of the connecting piece 20 educated. The strand 12 is to a first main surface of the electric wire welding section 22 ultrasonically welded.

The ultrasonic welding device 30 includes two pressurizing elements 32 . 34 , Then, while the connection section 22 for an electric wire positioned on one of the pressurizing members, namely, the pressurizing member 32 , the strand 12 on the connecting section 22 positioned for one electric wire, and both are passed through the other pressurizing element 34 compressed from above. That is, an overlapping arrangement of a connecting portion 22 for an electric wire and the wire 12 between the two pressurizing elements 32 . 34 is embedded. In this condition, ultrasonic vibrations will be delivered to the other pressurizing element. In this way, the connection section 22 for an electric wire and the wire 12 ultrasonically welded.

The inventors have made several objects, each of which is ultrasonically welded to the strand 12 and the connection section 22 for an electric wire has been obtained, and the holding force of each of the objects measured. As a result, it was found that some of the many sample pieces had a very small holding force, as in 2 shown. It should be noted that the holding force is the tensile strength between the connector and the electric wire.

A study conducted by the inventors on the cause of the problem described above has shown that the reason is that those of the several, the strand 12 forming individual wires 13 near the connecting section 22 are arranged for an electric wire, by ultrasonic vibrations relative to the connecting portion 22 slipped for an electric wire, as in 3 shown. That is the respective, the strand 12 forming individual wires 13 , are relatively thin, rectilinear bodies, and thus can withstand a certain amount of force in the pulling direction. However, they can be relatively easily bent by the application of a force in the direction of compression. Therefore, when ultrasonic welding is performed in the above-described manner, those of the plural individual wires 13 near the connecting section 22 are arranged for an electric wire, gradually move to its proximal end. As a result, during the ultrasonic welding operation, gradual changes of a portion of the joint portion occur 22 for an electrical wire to be contacted and a portion of the strand 12 which is to be brought into contact, which makes it difficult to expand the contact surface on which the connecting portion 22 for an electric wire and the wire 12 be brought so close together that their metal atoms can form bonds. As those of the several of the individual wires 13 near the connecting section 22 are arranged for an electric wire, are moved to the proximal end by ultrasonic vibrations, the contact area between the strand increases 12 and the connection section 22 for an electric wire.

The inventors found the cause described above and concluded that at the time of ultrasonic welding a strand 12 that have multiple strands 13 and an object to be welded thereto, eg a connecting section 22 for an electric wire, a welding method could be adapted to include the steps of: embedding an overlapping arrangement from an end portion of the strand 12 and an object to be entrapped therewith, eg the connection section 22 for an electric wire, between two pressurizing members 32 . 34 (Step (a)); and ultrasonic welding the overlapping assembly from the end portion of the strand 12 and the object to be welded therewith, eg the connecting portion 22 for an electric wire between the two pressurizing elements 32 . 34 is embedded, with a force acting toward the distal end of the strand 12 is directed to those of the several individual wires 13 is exercised on one side of the object to be welded, eg connecting section 22 for an electric wire (step (b)).

With this method, the individual wires are less likely to be between the stranded wire 12 and the object to be welded therewith, eg the connecting portion 22 for an electric wire, displaced during the ultrasonic welding operation, thereby allowing the end portion of the stranded wire 12 and the object to be scrapped with it, eg the connection section 22 for an electrical wire, with as high welding strength as possible to weld.

Hereinafter, a method for welding a strand and an object to be welded thereto will be described, an ultrasonic welding device, a welded product of a strand and an object to be welded thereto, and a connector according to a more specific embodiment.

EMBODIMENT

Welded product from a strand and an object to be welded therewith.

First, a welded product of a strand and an object to be welded thereto will be described. Here, a case will be described in which the welded object is a connector 20 is, or in other words, a welded product made of a stranded wire 12 and a connector 20 , 4 is a schematic perspective view showing the product of a stranded wire 12 and a connector 20 shows. 5 is a schematic cross-sectional view of the welded product.

The strand 12 is a cluster of multiple strands 13 , Usually, the several individual wires 13 twisted together. Every single wire 13 is formed by a metal wire of copper, a copper alloy, aluminum, an aluminum alloy or the like. A sheath 14 is around the outer circumference of the strand 12 formed by, for example, an extrusion coating of resin. At the wire 12 it is the strand 12 of the electric wire 10 , The jacket 14 is at the end portion of the electric wire 10 removed to an end portion of the strand at the end portion of the electric wire 10 expose. The jacket 14 does not necessarily have on the outer circumference of the strand 12 be educated. As a strand 12 For example, a stranded wire obtained by stranding metal wires into a tubular form could also be used.

The connector 20 is a member formed by molding a metal plate made of copper, a copper alloy, or the like, and has a connecting portion 21 for counterparts and a connecting section 22 for an electric wire on.

The connecting section 21 for counterparts is a portion that can be connected to a conductive portion of a component of a counterpart, such as a connector of the counterpart or a metallic body of a vehicle. Here is the connection section 21 for counterparts as a plate-shaped part (here a circular plate) set up a hole 21h to insert a bolt. That is, here it is assumed that a round connector used as a grounding connector is used as the connector 20 is used. The connecting section 21 for counterparts may also be formed in a different shape, for example the shape of a contact lug or a pin-shaped male connector, or the shape of a circular or cylindrical female connector.

The connecting section 22 for an electric wire is a section of the electric wire 10 to be connected. The connecting section 22 for an electric wire goes into an above-described end portion of the connecting portion 21 for counterparts and includes a connecting portion 23 for strand and a connecting section 24 for a sheath. The connecting section 23 for strand is on the to the connecting section 21 provided for counterpart closer side and the connecting portion 24 for a sheath is on the of the connecting portion 21 provided for counterparts farther away side.

The connecting section 23 for strand comprises a plate-shaped bottom section 23a and two side wall sections disposed on opposite sides thereof 23b , The bottom section 23a goes into the connection section 21 for counterparts over and the two sidewall sections 23b are upright, towards the first major surface of the bottom section 23a at the opposite side portions of the bottom portion 23a arranged. The strand 12 becomes the first major surface of the bottom section 23a , between the two Sidewall portions 23b ultrasonically welded. It should be noted that the two side wall sections 23b can be omitted.

The connecting section 24 for a casing comprises a bottom portion 24a and two crimping jaws 24b , The bottom section 24a goes into the above-described bottom section 23a over and runs in the opposite direction to the connecting section 21 for counterparts. The two crimping jaws 24b stand upright at the two end portions of the bottom portion 24a the first major surface of the bottom section 24a , Together with an end portion of the casing 14 which is on the first main surface of the bottom section 24a is positioned, the two crimping jaws 24b squeezed inside and bent over. Consequently, the end portion of the sheath becomes 14 squeezed to between the bottom section 24a and the two crimping jaws 24b to be held. It should be noted that the connecting section 24 can be omitted for a sheath.

Because the wire 12 and the bottom section 23a pressed together and ultrasonically welded while overlapping each other, the interposed welding portion has a structure in which the strand 12 and the bottom section 23a overlap flat. It should be noted that the stranded wire 12 and the bottom section 23a are ultrasonically welded and that the multiple individual wires are also ultrasonically welded together.

At the time of ultrasonic welding, a force is applied towards the distal end of the strand 12 is directed to those of the several individual wires 13 exercised on the side of the connecting section 22 are arranged for an electric wire, whereby a shape is formed in which the distance between a part (see 5 shown interface E1 ) of the strand 12 that with the bottom section 23a has been welded, and a part opposite this (see an in 4 and 5 shown area E2 on the top) at least partially in a direction in which the strand 12 runs, to a distal end of the strand 12 gradually increases. Accordingly, those of the several individual wires 13 that are close to the bottom section 23a are also less likely to be shifted to the proximal end compared to the others. This makes it possible to move between the strand during the time of ultrasonic welding 12 and the bottom section 23a to prevent and ensures in the welded state for a sufficiently large, intermediate welding surface. Accordingly, the end portion of the strand can 12 and the bottom section 23a of the connector 20 be welded together with as high a welding strength as possible.

Ultrasonic welding device

An example of an ultrasonic welding apparatus capable of producing the welding product described above will be described below. 6 is a schematic perspective view showing an ultrasonic welding device 30 shows.

The ultrasonic welding device 30 serves to the strand 12 and the above-described connector 20 to weld together and includes two pressurizing elements 32 . 34 and an ultrasonic transducer 40 ,

The two pressurizing elements 32 . 34 can have an overlapping arrangement of the strand between them 12 and the bottom section 23a of the connection section 23 for strand of the connector 20 embed.

Here is one of the Druckbeauschlagungselemente 32 . 34 a recording tool 32 that is capable of the bottom section 23a of the connection section 23 for strand of the connector 20 store, with the bottom section 23a is placed on this. On a top of the pickup tool 32 is a placement section 33 provided the floor section 23a of the connection section 23 for strand of the connector 20 stores by the bottom section 23a placed on it. The pick-up hoist 32 itself is formed, for example, in a form in which both edges have been cut off on one side of a rectangular block formed from the whole (viewed from above as a pentagon or Hausform). The shape of the picking tool is not particularly limited as long as the shape is the bearing of the bottom portion 23a in the way that allows the bottom section 23a placed on it. In 6 etc., is the pickup tool 32 shown in simplified form.

The other of the two pressurizing elements 32 . 34 , is a sonotrode 34 , above and the recording tool 32 is positioned opposite and extending in the direction of the picking tool 32 and move away from it. Below the sonotrode 34 is a press section 35 formed, the one with the bottom section 23a overlapping end portion of the strand 12 compresses. For example, the sonotrode itself is formed in an oblong vertical plate shape, and its front side (electric wire-facing side) is formed in a shape extending in a direction toward the upper and lower end, gradually toward the proximal end (the distal end of the connector). The shape of the sonotrode 34 is not limited, as long as the shape allows the sonotrode 34 the strand 12 from above the bottom section 23a zusammenzudrückt. In 6 etc., is the sonotrode 34 shown in simplified form.

An ultrasonic transducer 40 which generates ultrasonic vibrations is to the sonotrode 34 coupled and the ultrasonic vibrations generated by the ultrasonic vibrator 40 be generated, be to the strand 12 and the bottom section 23a through the sonotrode 34 issued. Usually, ultrasonic vibrations are applied to the strand 12 and the bottom section 23a as vibrations in one direction in the strand 12 passes.

The placement section 33 and the pressing section 35 are shaped so that the gap between a surface to be welded (top) of the bottom portion 23a , of the object to be welded, by the recording tool 32 is stored and the pressing section 35 with which the sonotrode 34 an end portion of the strand 12 compressed, can be selected such that the gap at least partially in the direction in which the strand 12 runs to the distal end of the strand 12 gradually increases.

Here is the pressing down section 35 the sonotrode 34 on a, in the horizontal direction (in the direction perpendicular to the direction of gravity) extending surface formed.

The upward placement section 33 of the pickup tool 32 is shaped the bottom section 23a to store in a direction in which the bottom section 23a from the pressing section 35 to a distal end of the strand 12 gradually recedes. More precise is the placement section 33 formed in a shape in which a part of the strand 12 at the distal end, relative to a portion of the strand 12 at the proximal end, about a step portion 33S recedes. By applying a downward force to the bottom section 23a while the bottom section 23a on the placement section 33 stores, moves a part of the bottom section 23a located at the distal end of the strand 12 is as if he is on a return 33g who is on the placement section 33 at the distal end of the strand 12 is located, lowered, while part of the bottom section 23a that attaches to the proximal end of the strand 12 located on the top of the step section 33S stores, as in 7 shown. Consequently, the bottom section is stored 23a on the placement section 33 in a direction in which the bottom section 23a down to the distal end of the strand 12 down, inclined.

Consequently, it takes by embedding and pressurizing the bottom portion 23a and the strand 12 between the placement section 33 and the pressing section 35 the distance between the surface to be welded (top side) of the bottom section 23a and the pressing section 35 at least partially in a direction in which the strand 12 runs, to a distal end of the strand 12 gradually towards.

It should be noted that the placement section 33 and the pressing section 35 may have a smooth surface, or a surface on which fine protrusions and depressions are formed to slippage relative to the bottom portion 23a or to the strand 12 to prevent. 6 shows the pressing section 35 on the V-shaped elevations are in the direction of the width of the pressing section 35 are formed and in the direction in which the strand 12 runs parallel to each other. 6 also shows that on one through the step section 33s elevated part of the placement section 33 , square pyramidal elevations, are formed without spaces between each other.

It should be noted that when an embodiment in the multiple surveys on the entire upper surface of a picking tool 32 are formed, is changed to an embodiment in which the bottom portion 23a on top of the pickup tool 32 stored in a tilted direction, the section with the elevations 33P at the distal end of the strand 12 from several surveys 33P at the top of a pickup tool 32 is formed, can be flattened, and at the proximal end of the strand 12 trained surveys 33P , on the top of the pickup tool 32 , as in 8th shown, can be left standing. In this case, a part of the recording tool 32 at the distal end of the strand 12 is positioned, the bottom section 23a store at a position that is around the elevation distance of the elevation 33P is lower than the part positioned at the proximal end and therefore the bottom section 23a can store in a tilted direction. In this case, a commonly used recording tool 32 be set up by minor and simple editing, the bottom section 23a to store in an inclined direction.

Referring back to 6 , are at opposite end portions of the picking tool 32 supporting bearing sections 70 provided, which is the connector 20 from opposite sides compress and store. Below the side along which the connecting section 24 for a jacket relative to the pick-up train 32 runs is a supportive placing portion 72 provided that the connecting section 24 for a sheath stores by the connecting section 24 for a shell is placed on it. The supporting storage section 70 and the supporting placement section 72 can also be omitted.

welding processes

The following describes a method for welding the stranded wire 12 and the connector 20 using the ultrasonic welding apparatus described above 30 ,

First, an overlapping arrangement becomes an end portion of a strand 12 and the bottom section 23a of the connector 20 between the pickup tool 32 and the sonotrode 34 embedded. More precisely, the bottom section 23a of the connector 20 on the placement section 33 of the pickup tool 32 placed. Likewise, the at an end portion of the electric wire 10 exposed strand 12 on the bottom section 23a positioned. Then the sonotrode 34 lowered to the pressing section 35 against the, the bottom section 23a opposite section of the strand 12 to squeeze.

Then it will be like in 9 shown the overlapping arrangement of the end portion of the strand 12 and the bottom section 23a between the picking tool 32 and the sonotrode 34 embedded is ultrasound welded, with a force acting towards the distal end of the strand 12 is directed to those of the several individual wires 13 is exercised on the side of the bottom section 23a are arranged. In this state, as described above, the bottom portion 23a down, toward the distal end of the strand 12 inclined. Thus, the sonotrode acts on a downward moving force F as a force F1 containing the several individual wires contained in the strand 13 (including those near the bottom section 23a are arranged), perpendicular to a surface to be welded 23FA of the bottom section 23a presses and as a force F2 containing the several individual wires 13 towards the distal end of the strand 12 pushes down. This allows the strand and the bottom section 23a To weld ultrasound while the single wires 13 be prevented from relative to the bottom portion 23a to the proximal end of the strand 12 to be moved. Although at this time the single wires 13 still slightly relative to the bottom section 23a can be moved, the shift is small, compared with the in 1 shown case. Consequently, the welding strength is significantly improved.

effects

With the method for welding a strand and an object to be welded thereto, the ultrasonic welding device, etc., arranged in the above-described manner, an overlapping arrangement becomes out of the end portion of the strand 12 and the bottom section 23a between the picking tool 32 and the sonotrode 34 embedded, ultrasonically welded, with a force acting toward the distal end of the strand 12 is directed to those of the several individual wires 13 is exercised, which is near the bottom section 23a are arranged. Consequently, the individual wires 13 less likely between the strand 12 and the bottom section 23a postponed. That is, while ultrasonic vibrations are emitted, it is less likely that the strand 12 and the bottom section 23a relative to each other, so that it is easily possible to increase the contact area, on which they are brought close to each other to such a degree that their metal atoms can bond with each other, and thus it is possible, a good ultrasonic welded region over a large To get area. Moreover, the contact surface between the strand 12 and the connection section 22 for an electric wire to be increased as much as possible. Consequently, the end portion of the strand can 12 and the bottom section 23a be welded together with as high a welding strength as possible.

In particular, according to the present embodiment, the bottom portion 23a supported by the placement portion in a direction in which the bottom portion 23a from the pressing section 35 to a distal end of the strand 12 gradually recedes. Consequently, the force directed towards the distal end can be easily applied to the individual wires 13 the strand 12 be exercised.

In particular, it is in the ultrasonic welding apparatus 30 difficult to change the sonotrode that transmits the ultrasonic vibrations, with regard to the resulting effects on the propagation characteristics of the vibrations and the like, whereas it is relatively easy, the shape and the like of the picking tool 32 to change. This too is an advantage in that it is relatively easy to change the design and the like such that the picking tool covers the bottom portion 23a stored in a tilted direction.

Moreover, this is part of the placement section 33 of the pickup tool 32 leading to the distal end of the strand 12 is arranged, in a simple form, namely as through the step portion 33S deposed, educated, thereby Compared with the case where the entire placement portion is formed as a sloped surface, the shape is easier to form.

MODIFICATIONS

Based on the embodiment described above, various modifications will be described.

10 is a schematic illustration showing a recording tool 132 after a first modification shows. In the first modification is an upward placement section 133 of the pickup tool 132 , the recording tool 32 accordingly, formed in an inclined shape gradually toward the distal end of the strand 12 decreases. Thus, as in the embodiment described above, it is possible to perform ultrasonic welding while one is the sonotrode 134 down moving force F as a force F1 , the several individual wires contained in the strand 13 (including those near the bottom section 23a are arranged), against a surface to be welded 23FA of the bottom section 23a presses vertically and as a force F2 , the several individual wires 13 towards the distal end of the strand 12 suppressed. As a result, it is possible to obtain the same effects as those of the above-described embodiment except for the steps of forming the step portion 33S provided effect.

11 is a schematic illustration which is a recording tool 232 and a sonotrode 234 after a second modification shows.

In this modification is an upward placement section 233 of the pickup tool 232 that the pickup tool 32 corresponds, aligned horizontally. Instead, it is a downward pressing area 235 the sonotrode 234 that of the sonotrode 134 corresponds, gradually, towards the distal end of the strand 12 towards the top (in a placement section) 233 opposite direction) inclined. Consequently, it is possible to perform ultrasonic welding while applying a force F is exercised, with which the pressing section 235 the sonotrode 234 the strand 12 squeezes as a force F1 several who are in the strand 12 contained individual wires 13 (including those near the bottom section 23a are arranged), perpendicular to the surface to be welded 23FA of the bottom section 23a presses and as a force F2 several of the individual wires 13 towards the distal end of the strand 12 suppressed. Consequently, it is possible to obtain the same effects as those of the above-described embodiment except for the effect of forming the shape including the bottom portion 23a in a tilted direction on the pickup tool 32 stores, is provided.

The first and second embodiments described above are examples of the method and apparatus for performing the ultrasonic welding in a state in which the gap between the positions where the picking tool 132 . 232 or the sonotrode, the overlapping arrangement of the end portion of the strand 12 and the bottom section 23a pressurized, at least partially in a direction in which the strand 12 runs, to a distal end of the strand 12 gradually increases.

It should be noted that an embodiment may be adapted so that both the placement portion and the pressing portion are inclined. Alternatively, either the placement portion or the pressing portion may be partially in a direction in which the strand 12 can be inclined and the remaining portion can be inclined either in the horizontal direction or in the opposite direction.

12 and 13 show schematic illustrations showing a connector 320 according to a third modification. In this modification is an upward placement area 333 of the pickup tool 332 that the pickup tool 33 corresponds, aligned horizontally. In addition, there is a downward pressing section 335 the sonotrode 334 that of the sonotrode 34 corresponds, also aligned horizontally. That is, the ultrasonic welding apparatus has the same configuration as that of a conventionally used welding apparatus.

Instead, it's a floor section 323a of the connector 320 that the connector 20 corresponds, as an inclined surface 323f formed, the height distance gradually toward the connection portion 21 for counterparts decreases. Here, the central, in the direction of the width of the bottom section 323a extending part, formed, partially in the direction of a first major surface (side on which the strand 12 to be welded), resulting in a survey 323P is formed. The assessment 323P looks like a return when the bottom section 323a from the opposite direction. Then there is an area of the survey 323P which is disposed on the side on which the side wall portion 23b is formed, as an inclined surface 323f formed, the height distance gradually toward the connection portion 21 for counterparts decreases.

After this modification is characterized by that of the bottom section 323a in a horizontal direction is stored as if on the placement section 233 is placed, the strand 12 is positioned on it and the stranded wire 12 through the press section 335 pressed against it, the distance between the inclined surface 323f and the pressing section 335 gradually increase toward the distal end of the strand. Consequently, the force acts F with which the sonotrode 334 is directed downwards, as a force F1 that several of the in the strand 12 contained individual wires 13 (those comprising, near the inclined surface 323f are arranged), perpendicular to the inclined surface 323fa of the bottom section 23a presses and as a force F2 comprising a plurality of the individual wires 13 in the direction of the distal end of the strand 12 pushes, which allows the end portion of the strand 12 and the bottom section 323a to weld with as high a welding strength as possible.

Although the embodiment and the modifications have been described, by way of example, the stranded wire 12 and the connector 20 are called as an object to be welded to be welded together, the object to be welded can also be another metallic object, eg a stranded wire 512 be.

In an in 4 shown fourth modification, the strand 12 and another strand 512 between a pickup tool 532 and a sonotrode 534 while they are overlapped with each other and pressed together in this state, the stranded wire 12 and the other wire 512 Ultrasonically verschwes together.

Here is an upward placement section 533 of the pickup tool 532 that the pickup tool 33 corresponds, horizontally aligned and a downward pressing section 535 the sonotrode 534 that of the sonotrode 34 corresponds, is gradually upward (in the press section 533 direction away) toward the distal end of the strand 12 down, inclined. Consequently, it is possible to perform ultrasonic welding while applying a force F is exercised, with which the pressing section 535 the sonotrode 534 the strand 12 squeezes as a force F1 several of them in the strand 12 contained individual wires 13 (including those near the strand 512 are arranged), perpendicular to the surface to be welded 512fa the strand 512 presses and as a force F2 several of the individual wires 13 towards the distal end of the strand 12 suppressed. This allows the strands 12 . 512 to weld with as high a welding strength as possible.

It should be noted that the embodiments described in the embodiments and the modifications can be suitably combined with each other as long as there are no contradictions. For example, it is possible the connector directly through the pick-up tool 32 to store in an inclined direction while the strand 12 is compressed directly by the pressing portion in an inclined direction.

Although the present invention has been described in detail, the foregoing description is in all aspects illustrative and the invention is not limited thereto. It is to be appreciated that innumerable modifications, not explained herein, may be made without departing from the scope of the present invention.

It should be noted that 15 is a graph showing the relationship between the number of the specimen and the holding force when the stranded wire 12 and the connector 20 have been ultrasonically welded together by a method of an aforementioned embodiment. As in 15 showed that a reliable holding force has been achieved for many specimens.

LIST OF REFERENCE NUMBERS

10

Electric wire

12

braid

13

single wire

20, 320

joint

21

Connection section for counterparts

22

Connection section for an electric wire

23

Connecting section for stranded wire

23a, 323a

bottom section

23FA

to be welded surface

30

Ultrasonic welding device

32, 132, 232, 332, 532

recording tool

33, 133, 233, 333, 533

placing portion

33S

step portion

34, 134, 234, 334, 534

sonotrode

35, 235, 335, 535

Press section

40

Ultrasonic vibration source

323f

inclined surface

323P

survey

512

braid

512fa

to be welded surface

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2014143177 A [0003]

Claims (10)

Welded product of a strand and an object to be welded therewith, comprising: a strand having a plurality of individual wires; and an object to be welded which has been ultrasonically welded to the strand while overlapping the strand, wherein a distance between a part of the strand which has been welded to the object to be welded thereto and a part of the strand opposite thereto at least partially in a direction in which the strand extends gradually increases toward a distal end of the strand. Welded product made of a strand and an object to be welded with it, after Claim 1 wherein the object to be welded is a connecting portion for a strand of a connecting piece. Connector comprising: a connection portion for a strand having a plate-shaped part; and a counterpart connecting portion that merges into an end portion of the connecting portion for strand, wherein the plate-shaped part has an inclined surface whose height distance gradually decreases toward the counterpart connecting portion. An ultrasonic welding apparatus for ultrasonic welding a strand having a plurality of individual wires to an object to be welded therewith, comprising: two pressurizing elements between which an end portion of the strand and an object to be welded overlapping therewith are embedded; and an ultrasonic vibration source that emits ultrasonic vibrations to one of the two pressurizing elements, wherein a space between a surface to be welded of the object to be welded, which is supported by one of the two pressurizing elements, and a part of the other of the two pressurizing elements, which compresses the end portion of the strand, is selected such that the space is at least partially in one direction, in which the strand runs, gradually increases towards a distal end of the strand. Ultrasonic welding device after Claim 4 wherein one of the two pressurizing members has a placing portion which supports the object to be welded with the object to be welded thereon, the other of the two pressurizing members has a pressing portion which presses an end portion of the strand overlapping with the object to be welded, and the placing portion is so is shaped so that the object to be welded superimposed in a direction in which the object to be welded gradually recedes from the pressing portion to a distal end of the strand. Ultrasonic welding device after Claim 5 wherein the placement portion is shaped so as to recede at the distal end of the strand, and supports the object to be welded such that the object to be welded is inclined downwardly at the distal end of the strand. A method of welding a strand and an object to be welded thereto to ultrasonically weld a strand comprising a plurality of individual wires and an object to be welded therewith, comprising the steps of: (A) embedding an overlapping arrangement of an end portion of the strand and an object to be welded therebetween between two Druckbeaufschlagungslementen; and (b) ultrasonically welding the overlapping array of the end portion of the strand and the object to be welded therewith sandwiched between the two pressurizing elements with a force directed toward the distal end of the strand applied to those of the plurality of individual wires; which are arranged on one side of the object to be welded therewith. A method for welding a strand and an object to be welded with it Claim 7 wherein in the step (b), the ultrasonic welding is performed in a state in which a gap between a surface to be welded of the object to be welded, which is supported by one of the two pressurizing elements, and a part, with the other of the two pressurizing elements compresses the end portion of the strand, at least partially in a direction in which the strand extends, gradually increases towards a distal end of the strand. Method of welding a strand with an object to be welded thereto Claim 7 wherein in the step (b), the ultrasonic welding is performed in a state in which a gap between positions where each of the two pressurizing members presses the overlapping arrangement of the end portion of the strand and the object to be welded thereto at least partially into a direction in which the strand extends gradually increases towards a distal end of the strand. Method for welding a strand and an object to be welded therewith according to one of Claims 7 to 9 wherein the object to be welded is a connecting portion for a strand of a connecting piece.

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